![Tushar Behera](/assets/img/avatar_default.png)
plat/devs.h is not required in this file. Signed-off-by: Tushar Behera <tushar.behera@linaro.org> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
185 lines
4 KiB
C
185 lines
4 KiB
C
/*
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* Exynos Generic power domain support.
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Implementation of Exynos specific power domain control which is used in
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* conjunction with runtime-pm. Support for both device-tree and non-device-tree
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* based power domain support is included.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/pm_domain.h>
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#include <linux/delay.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/sched.h>
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#include "regs-pmu.h"
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/*
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* Exynos specific wrapper around the generic power domain
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*/
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struct exynos_pm_domain {
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void __iomem *base;
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char const *name;
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bool is_off;
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struct generic_pm_domain pd;
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};
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static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
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{
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struct exynos_pm_domain *pd;
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void __iomem *base;
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u32 timeout, pwr;
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char *op;
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pd = container_of(domain, struct exynos_pm_domain, pd);
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base = pd->base;
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pwr = power_on ? S5P_INT_LOCAL_PWR_EN : 0;
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__raw_writel(pwr, base);
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/* Wait max 1ms */
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timeout = 10;
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while ((__raw_readl(base + 0x4) & S5P_INT_LOCAL_PWR_EN) != pwr) {
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if (!timeout) {
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op = (power_on) ? "enable" : "disable";
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pr_err("Power domain %s %s failed\n", domain->name, op);
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return -ETIMEDOUT;
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}
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timeout--;
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cpu_relax();
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usleep_range(80, 100);
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}
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return 0;
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}
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static int exynos_pd_power_on(struct generic_pm_domain *domain)
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{
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return exynos_pd_power(domain, true);
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}
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static int exynos_pd_power_off(struct generic_pm_domain *domain)
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{
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return exynos_pd_power(domain, false);
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}
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static void exynos_add_device_to_domain(struct exynos_pm_domain *pd,
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struct device *dev)
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{
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int ret;
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dev_dbg(dev, "adding to power domain %s\n", pd->pd.name);
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while (1) {
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ret = pm_genpd_add_device(&pd->pd, dev);
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if (ret != -EAGAIN)
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break;
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cond_resched();
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}
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pm_genpd_dev_need_restore(dev, true);
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}
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static void exynos_remove_device_from_domain(struct device *dev)
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{
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struct generic_pm_domain *genpd = dev_to_genpd(dev);
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int ret;
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dev_dbg(dev, "removing from power domain %s\n", genpd->name);
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while (1) {
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ret = pm_genpd_remove_device(genpd, dev);
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if (ret != -EAGAIN)
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break;
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cond_resched();
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}
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}
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static void exynos_read_domain_from_dt(struct device *dev)
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{
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struct platform_device *pd_pdev;
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struct exynos_pm_domain *pd;
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struct device_node *node;
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node = of_parse_phandle(dev->of_node, "samsung,power-domain", 0);
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if (!node)
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return;
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pd_pdev = of_find_device_by_node(node);
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if (!pd_pdev)
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return;
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pd = platform_get_drvdata(pd_pdev);
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exynos_add_device_to_domain(pd, dev);
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}
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static int exynos_pm_notifier_call(struct notifier_block *nb,
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unsigned long event, void *data)
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{
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struct device *dev = data;
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switch (event) {
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case BUS_NOTIFY_BIND_DRIVER:
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if (dev->of_node)
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exynos_read_domain_from_dt(dev);
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break;
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case BUS_NOTIFY_UNBOUND_DRIVER:
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exynos_remove_device_from_domain(dev);
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break;
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block platform_nb = {
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.notifier_call = exynos_pm_notifier_call,
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};
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static __init int exynos4_pm_init_power_domain(void)
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{
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struct platform_device *pdev;
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struct device_node *np;
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for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
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struct exynos_pm_domain *pd;
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int on;
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pdev = of_find_device_by_node(np);
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pd = kzalloc(sizeof(*pd), GFP_KERNEL);
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if (!pd) {
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pr_err("%s: failed to allocate memory for domain\n",
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__func__);
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return -ENOMEM;
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}
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pd->pd.name = kstrdup(np->name, GFP_KERNEL);
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pd->name = pd->pd.name;
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pd->base = of_iomap(np, 0);
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pd->pd.power_off = exynos_pd_power_off;
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pd->pd.power_on = exynos_pd_power_on;
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pd->pd.of_node = np;
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platform_set_drvdata(pdev, pd);
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on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;
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pm_genpd_init(&pd->pd, NULL, !on);
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}
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bus_register_notifier(&platform_bus_type, &platform_nb);
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return 0;
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}
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arch_initcall(exynos4_pm_init_power_domain);
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